Oscillating grinder.



PatentedApr.8,l9l9.

sfsHEEssHEETI OSCILLAUNG GRINDER. APPLICATION HLED Nov. 1916.

F. H. HALSTEAD. OSCILLATING GRINDER..

APPLICATION` FILED NOV.7|196.

Patented Apr. 8,1919.

v mgmm 3 SHEETS-SHEET 3.

` speed, the loss oi efficiency arising Be ily lmewii that li. Frise-ERICE HENRY 5ML-estremi. :i citizen e?? lie lrrteii Siaies, and. a resideir: of Worcester, enmity of livercest-er and if Masseehusetize have inverred am ziiprovemeri in seillating Grinders. of

viiieh ihe following; deseri'p tien, iii eemieeieri with Lhe eceemperiying drawings, e. epeeien'i-ieii, like ehereeteie mi the drawings representing. like This inveriibien pertains Le iu prevemeirs in grinders more narieiilerl 1 ihmwhl L, i. 7 a

'ing che "wel, This is probably fer ihe 'few een lizithe :Leie of roizition or the work hout its axis is much iower than ehe raie of roteiioii @1" the grinding me! and c0nseqneiily lees chatter i" is present when 'he work is oeeillate than when the me! is oseillaed. For Ehe purpoee of many phases of the present invention, either work or roel may be ermiateiy eeeillated. In hie application 'the Word oscillation umlthe used in its true senee 0i: arcuate escille tion or rocking.

lt' has hereeore been the usual practice to oscillare the oscillating element of toels of this dass; crank. comiectu i rod ind oscilhring erm., or by calm 0r Siiisihrr medianienl, in whieh the rute of eseiiietifm of he oeciilating mem-y ber is variable, usually heine7 more rapid et or near the center of osciliatien than howard the ends hereef. There ie film euiiieierit spring in nnichines of this Giese i0 render the amount of mami-iai ahrecled in Some measure dependent on the relative period of cot-iwi, of the work and grinding moi. Thus che previous grinders referred to have predueee rh-ces which are not truly arcuate in @mss eecion, but which are somewhat flattened toward the edges 0i' the race.

Another disadvantage or' oscillating grinders, in which fhe toei and Work :are -relaively arcimi'ely traversed afl/ me Whle lem e lowered average Speed of relaive nrawer7 hy er hrough the medimn of 'for the pimpen? maximum' Speed must not be exeeefied er the estes perzieno the raveree anni the oi v the fir-averse being siew'er, necessarily reduces @he average rate 0f triiveree and the eliieieney oi: 'the arrechino.

'irioher defect of hall rece grinders as previously eenerieed, arises from the unamidahie Bering of the machine, in rhein if -he oseiiietien he shipped 'While the' tool i n Geweest, wiihjzhe werk ehe too will 'mie i@ grime. fer een'sierehle period me. Wihofaiz verse feed ef eii'her er ehre'zlieg en irreguieriy in elle ce' ei? ehe ieee. feature of fhe .sieeii mier i5 im mme sreppage @if uhusmile mi?. ei erzdi'o' @Scilia- "tion when the Werk midrinihg eei ere not iii eefnieet. Tiiie has the additional advantage that the werk and mol are in p@- sition te be reiatively 'moved aper; for iiispection of 'ehe werk Wihou, disturbing' *.'he sicljustmeii'rs,. ehouid it he necessary to continue the grinding; eperetion.

A third abject of my irivenieii is to previde zx transverse feed, Whieh is exitomzitieally diseon'cinue when the Werk and tool :lire seperated :for inspection of he work. or for nher reason.

A. eurth ehj'ee of my imveuion is to provide a rsiiiererse eefl 0i improved design, which epera'es when the work-:md tool are ir. proper :iiiiai relai-imi one another, but milky 'when ehe Werk and $2001 ere not i con met vvih @ech ofl'ier.

My inve iieri prevides improved Ineens for changing the amplitude of rele tive oseillzition 0f 'wel .sind Work. and improved means for changing; lthe lielfl me oseiilfition 0i the esciiiatory eiement. lh connec'sien wih Changes of amplitude @i 0er eiiieioi. u1 he work, my invention meintziins a censant relative speed of Qscilhition of veel and Work, Whether the amplitude of appear, x10 jsuch ladjuemeiiu is iieeesseny in conneetiozi'with my invention and an ehso hitely cpneeh relative traverse is rovided,

regardless of changes in the amp itilde or field of oeeillaiion.

heimwee?. figir. $119.

The above improvements while peculiarly eulvantageous in combination with each other, may be used to advantage separately on any type of oscillating race grinder.

vOther objects and advantages of the invention will appear in the description.

The drawings show an illustrative embodiment of a preferred construction of my invention. of which- Figure 1 is a side elevation partly in section;

Fig. center line of Fig. 1;

Fig. 3 is a partial end elevation of the preferred construction illustrated in Fig. 1:

Fig. 4 is a partial vertical transverse section on the line 1f-1 of Fig. 1;

Fig. 5 is a side elevation partly in section on thel line of Fig. 4;

Fig. 6 is a plan view of a portion of the transverse feed mechanism shown in Fig. 1;

Fig. T is a vertical section partly in elevation on the line T T of Fig. 6; and

Fig. 8 is a plan view partly in section on the. line Sk8 of Fig. "2.

In the illustrative embodin'ient of4 my invention shown in the drawings, I have shown a chuck S) holding-the work 10 and mounted on the work spindle 11. which is rotated in bearings 12 by a belt (not shown) on the pulley 13. The specific chuck 9 and work 1() illustrated are adapted for interior race grinding. but a chuck for exterior race grinding may be substituted in the well known manner.

The work spindle bearings 12 and parts carried thereby are preferably longitudi.

nally adjustable on the longitudinal work slide 14. by means of a hand screw 1.7. whlle sald bearings 12 and parts carried thereby,

.are preferably trtuisversely adjustable on the transverse work slide lt by the hand screw 17.

As before stated. I prefer that the work l() be oscillated relative to the grinding tool 18. rather than that the tool 1S be oscillatcd relative to the work. and to this end I have provided an oscillatory work support typitied by the oscillatory element 1U on which the work holding chuck f) is carried. preferably with the interposed transverse adjustment slides 14 and lo. as before described. The oscillating element may be and preferably is mounted on a pivotal shaft 20. which is preferably oscillatcd by constant-speed-oscillating means typied by the following preferred construction. .()n the shaft 20 I preferably provide a worm gear 21, adapted to be alternately engaged on its opposite sides by worms and :23 (Fig. 8), mounted in the swinging frame 21. which is pivoted at 25 to the frame ofthe machine. The worms 22 and 23 may be driven by a pulley 26 (Fig. 8), which may drive the worm directay and which may is a vertical section taken on the' drive the worm 23 through gears"27-28-29. As the worms and rotate continuously in the same direction, but on opposite. sides of the worm gear 21. the gear 21 will be oscillatcd in opposing directions. as and when the'frame 24 is swung from one side to thel other to alternately engage the worms and 23 with the worm gear 21. It is highly desirable that the const a'int-specdsoscillating means include reversing means, the operation of which is controlled by the movement ot' thel oscillatory means, that the amplitude of oscillation of the oscillatory means be variable and that the field of oscillation of the, oscillatory means be variable. To this end. in the illustrative embodiment of my invention shown in the drawings, I have shown the swinging frame 24 (Figs. 2 and 3) provided with a projecting portion 3() and the oscillating support provided with tappets 31-32, which are preferably adjustably attached thereto. A preferred construction for transmitting movement from the tappets 3132 to the swinging frame 24, includes the projection 33 in the. path of the tappets 31-32 and reciprocable with a slide 31 having a bearing 35 on the main frame 36. Attached to, and reciprocable with the slide 34. is a double wedge or cam 3i' adapted to alternately depress lugs 38- 3f) in levers lO--tL which levers are fulcrumcd at 42 and each of which is provided :24.,as the levers are rocked by the cam 37.

The force whichrocks the swinging cage :2-1

is alternately supplied by the ends ot' the levers JIU-'4L through spring supported vprojections'1G and .17, respectively.

In the position shown in Fig. 3, the oscillating support 1f) is traveling from right to left. When the tappet 32 strikes the projection 33. thelatter will shift the cam 3T.v depressing the lug 38 and rocking the lever 40. The end 1-1 of the lever 40 will coinpress the'spring supported element 46 toa considerable extent. before the catch 43 is disengaged fromv the swinging frame projection 30. 'hen the, catch 13 is disengaged. the spring supported projection 1t# acting against the lever end 41 will shift the. swinging frame 21`(Fig. 8), thereby disengaging one of the worms :Z2-23 from the worm geai 21 and engaging the other worm. During this traverse of the swinging frame. the projection 1? lwill rock the lever 11. thereby causing the catch 4st to engage t'lie swinging frame and hold it in shifted position until the reverse movement of the oscillating support is about to begin. The worms 22h23 impart movement. to the oscillating support at a rate which is constant during thel whole of each oscillation, and I prefer that the' worms 15 of the tappets 62 and 63.

thereby alternatively, at the will of the operator. engaging either ratchet 60-61 to feed the transverse feed slide 54 'in either direction.

f rThe discontinuance of the transverse feed 4is insured when the oscillation of the oscillating element is stopped because the tappets (S2- 63 are necessarily stopped, while the discontinuance of transverse feed is insured when the longitudinal slide 53 is retracted, even. if the oscillating element continues to oscillate because the shaft 69 with the tappet intercepting elements 71 and 72 are withdrawn from the eld of oscillation By the adjustability of the position of the tappets (S2-6331 am enabled to e'ect the transverse feed during the' periods ,when the tool is not in contact with the work and I l amenabled to maint-ain this relation when the amplitude of oscillation, or the field of oscillation of the oscillating element is changed. A

The setting up and operation of 'the machine described may be as followsz The work 18 is first firmly clamped in the chuck 9. The slides 14 and 16 are then adjusted to bring the work in such rela-tion to the Y axis-of oscillation of shaft 20 that the axis of the desired arcuate groove of the race coincides with the axis of oscillation. The grinding wheel 18 is then put in place and the forward stop of the longitudinal slide 53 is adjusted, so' that a, plane passed through the center of the grinding wheel,

transverse 4to its axis, will pass through `the axis of oscillation. rllhe transverse feed slide 54 may then be adjusted by hand, so,

'that one edge of the grinding-wheel 18 is 40 substantially against the work. In practice a roughly lnished groove in the work is 'usually provided prior oo the grinding operation. T he pin 48 is then preferably entered in tlie recess 49 and the oscillating element may be swung to one position, in which the gringing wheel, if operating, would no longer be in contact with the race. One of the reverse tappets 31--32 is then set in such position as to slightly displace the pin 33.

50 ft/'hilo the oscillating element is in this position, one of the feed tappets 6263 may be set to slightly displace its coperating element.

The oscillating element may then be' swung to such a position that the work and tool clear each other1 on the opposite stroke. The remaining reverse tappet and the remaining feed tappet may then be set.

" The machine is now ready for operation.

0f course, this setting operation is only necessary when the race to be ground are dissimilar for the race previously ground. The work may now be rotated about its own axis by imparting power to the pulley 13 t5 and the tool may be rotated by imparting power to the pulley 30. Power ina'y be iinparted to the oscillating means by t'he pulley 26. If now the pin 48 be retracted to per-y mit swinging of the worin cage 24, either worm may be engaged, imparting rotary movement in one direction to the work gear 21` and hence oscillating the oscillatory element. Assuming the initial oscillation to be 4,A so that the worm 23 will be disengaged l and the worm 22 engaged to reverse the oscillatory movement of the oscillatoryA ele- I ment. 1 A

As before stated, I prefer that the transverse feed take place at the periodI of reversal of oscillation. Therefore, at yaaibstantially the same time that the reverse'tappet 32 engages the pin 33, the-feed tappet 62 rocks the lever 72 (Fi 7), thereby moving the recprocatory mem er 69 to the left and moving the ratchet 60 or the ratchet 61 as desired, through the medium of the bell crank 74, the connecting rod '76, the arm '77' (Figs. 4 and 5) and the ratchet support 78. rIhis movement of the feed ratchet turns the feed screw o5 through the gears 58 and 59,

as vheretofore described, thereby imparting feeding movement to the transverse feed` slide 54 and to tire grinding wheel.

The oscillatory support is now on its movement to bring the reverse tappet 31 (Fig. 3) in contact with the reverse pin 33 and the feed tappet 63 (Fig. 6) in contact with the pin 71. Then the end of the desired oscillatory movement is reached, these and the coperating parts will .function insubstantia-lly the same manner as the corresponding parts heretofore described.

As before4 stated, the machine is preferably stopped at the end of an oscillation. When the iperator desires to stop the machine, l'ie'turps-the handle 50 one-,quarter revolution, sb that 'the cross pin 51 registers with the slot 52. The pin 48 will then be spring pressed against the frame 36 and, when the cage 24 is in semi-shifted position, with neither the worm 22 nor-the worm 20 engaging the worm gear 23, the pin 48 will register with and enter the recess 49, thereby holding both worms out of engagement and stopping the oscillating element. The

grinding tool will in this position be disengaged from the work and not as in other positions held against retraction by the arcuate lip of the race. Hence. the longitudinal slide 53 can be retractedl by the lever 54a to 130 tatable grinding wheel spindle, an oscillatory support for one of said spindles,.a driving element effective to impart oscillatory movement to said oscillatory support in .opposite directions, two oppositely effective driving -connections coupled for alternate engagement with said driving element, and

tappet means on the oscillating support vfor actuating said alternate engagement of said oppositely e'ective driving connections, said tappet means being adjustable to .vary the field of oscillation of said oscillatory element. 8. An oscillatinggrinder comprising, in combination, a rotatable work spindle, a rotatable grinding wheel spindle,a support 4 l combination, a. rotata for one of said spindlesoscillating, abolita fixed axis, andmeans cannprismg oppositely 'and alternately eiiective driving connections for automatically imparting oscillatory movement to said oscillatory support, whereby the work and grinding wheel are arcuately relatively traversed at constant speed throughout tlie contact of said work and grinding wheel.'

9.-An oscillating grinder comprising, in con-ibination, a rotatable work spindle, a rotatable grinding wheel spindle, an oscillatory supportfor one of said spindles; driv-. ingineans for said-oscillatoryv support including two -oppositely effective driving connections, and automatic reveise means for actuating alternate engagement of said driving connections includin r resilient means, and Va sliiftable cani shi ted by said oscillatory support but independent thereof, for

`loading said spring means, said cani means and cooperating parts .iei'iilitting said resilient means to be loa ed by said support while preventing movement of said oscillatory support by said resilient means.

10. An oscillating grinder comprising, in

combination, a rotatable work Spindle, a rotatable grinding wheel spindle, an oscilla.- tory support for one of said spindles, driving means for said oscillatory support includin a worin gear, two' worms supported with t eir axes in fixed relation to each other,.but both movable for alternate en -V gagement and disengagementwith said worm gear to impart rotaryf'movement iii opposite directions to saidgworm gear.

L11. An oscillating grinder comprising, in

le'work spindle, a rotatable grinding wheel spindle, an oscilla- @tory support for one of ,Saidv spindles, driv- A 4tng means for said oscillatory Asupport in- ;cludin -a wormgear, two worms supported vwith t eir axes infixed relation to each otber, but both movable for alternate en| -are out yof contact at .the end of an oscillatory stroke, and-means under the control of the operator, insuring stoppage of oscillation of said oscillatory support when the Work and grinding tool are out of contact at the end of an oscillatory stroke. l

13. An oscillating rrinder comprising, in combination, a rotata le work spindle, a rotatable grinding wheel spindle, an oscillatory support for one of said spindles, driving means for said oscillatory support, including a driving element effective to impart oscillatory noveluent to said oscillatory support in opposite directions,.two oppositely effective driving eonnectioLs'for alternate engagement witi said driving element and stoppagev means for holdingboth of said driving connections out of engagement with said driving element.

14. An oscillating grinder comprising, in combination, a rota-table work spindle, a rotatable grinding wheel spindle, an oscillatory support for one of said spindles,` drivingmeans for said oscillatory support, including a driving element effective to impart oscillatory movement to said oscillatory support in opposite directions, two oppostely efectivedriving connections 4for alternate engagement With said driving element, automatic reverse means for actuating such alternate engagement, and Nmeans controllable by the operator for actuating such alternate engagement independently'of said automatic reverse means.

15. An oscillating grinder comprising, in combination, a rotatable work spindle, a

rotatable grinding wheel spindle, an oscillating support for one of said spindles, a transversely movablefeed support for the other of said spindles, and means on the .oscillatory support for automatically actuating reversal of said oscillatory support and for actuating feeding movement of said transversely movable feed support.

16. An oscillating grinder comprisin in combination, a rotatablev Worky spind e, a. rotatable grinding wheel spindle, an oscillating support for one of said "spindles, a

transversely movable feed support for the other ofsaid spindles, 'a longitudinal sliding support on which said feed support is mounted for longitudinal separation of the work and tool, and transverse feed actuating Leserin Y means operatively connected to said longitudinally slidable support and automatically discontinued by withdrawalot' said longitudinal sliding support.

17. An oscillating grinder comprising, in combination, a rotatable work carrying spindle, a rotatable grinding wheel spindle, an oscillatory support 19, the pivotal shaft 20 for said oscillatory support, the gearing 2l on said pivotal shaft, the shiftable cage 24 having gearing 22 and gearing 23 for alternate engagement with the gear 21 as the cage 9A is shifted, 'and cage shifting means actuated by oscillating of oscillatory supi port 19.

- 18. A-n oscillating grinder comprising, in combination, -a Arotatable grinding Wheel spindle, an oscillatory work carrying support 19, consta-nt speed driving 'means for rocking said oscillatory work carrying su port relative to said grinding Wheel spind e, and reversing means for-said driving means, including resilient mea-ns for storing energy and escapement means providing for sudden release of such stored energy.

19. An oscillating grindercomprising, in combination, a rotatable grinding 1 Wheel spindle, anoscillatory work carrylng support 19, constant speed driving means or' rocking said oscillatory work carrying support relative to said grinding Wheel spindle, and reversing means forsaid driving moeans, including the tappets 31-82 carried bysaid Vwork carrying support the cam 37, the rocking pawls 40-11 alternately engaged by sald cam, the shifting frame 21, and the spring supported elements 16--117 coperating with the catchers 43--44 for actuating the shifting of the frame 24 to reverse the direction of oscillationv of the oscillating Work carrying support 19.

20. An oscillating grinder comprising, in combination, a rotatable grinding Wheel spindle, a rotatable Work carrying spindle, an oscillatory support 19 for one of said spindles, a transversely movable feed support 51 for the other spindle, a longitudinally movable support 53 for said feed support, tappet means on `the oscillating support, `the transverse feed screw 55 and reciprocatory means carried by said longitudi nally movable support 53 for transmitting power from said tappet means to said transverse feed screw 55said tappet means and said reciproca-tory means being operatively disconnected on retraction of said longitudinally movable support. l

`In testimony whereof, Lha've-signed my name to this specication.

FREDERICK HENRY HALSTEAD. 

